Komentarz do artykułu K. F. B. Hempla "Uwagi na temat konserwacji rzeźby z marmuru i terakoty"

The above-presented paper by K.F.B. Hempel, who himself is well-known conservator and highly appreciated expert in the fie ld , deals with decay of marbles and terracotta and with the methods of their conservation. The goal the author of the comment has set before him consisted in dilating of some problems thus making them more intellegible for readers being not familiar with the problems discussed. The author broadens and makes comments of his own on such problems as the mechanism of patina forming in marble and its decay caused by the action of su lphuric oxides, temperature variations and water so luble salts; destructive e ffe c t of the foreign matter deposits on marble surfaces; application o f glues for joining the marble pieces; methods of supplementing the decrements; impregnating and structural reinforcing o f marbles apd terracotta, and, finally, the me thods applied in preparing the moulds for art casting o f replicas. In addition, the comment discusses the workability and usability of methods listed by F.B.K. Hempel under conditions of the Polish conservators’ practice.